HM Defense HMB Bolt - Black Nitride

The HMB bolt by HM Defense is a drop-in replacement for Mil-Spec M16 and AR-15 bolts, featuring a cam pin socket and tapered cam pin design to eliminate the natural weak point and improve reliability.

• The HMB bolt eliminates the natural weak point of Mil-Spec bolts by significantly increasing the amount of metal at the cam pin location.
• The HMB bolt reduces cam and firing pin contact and improves the smooth operation of the bolt carrier group.
• The HMB bolt is 100% compatible with Mil-Spec M16 and AR-15 BCGs.
• The HMB bolt is the same bolt offered as an upgrade on the Young Manufacturing National Match M16 BCG.